Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81481d21ac595ff…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba9b36930e721c3847386544fa4ee132 SHA-1: 2c3d7ff65355583fe0cabf6e9b2b1cba20e1de01 SHA-256: a81481d21ac595ff2dc1ad20e69627bb1292cd6942ec0c0c919f92fa59b33ba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which are disguised as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://irlanc.ru/uplcv?utm_term=apk+openvpn+connect' suggest a phishing attempt to trick users into downloading malicious software, likely an APK disguised as an OpenVPN client. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=apk+openvpn+connect PDF link annotation
    • http://cappellastudio.it/userfiles/files/47439940004.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/2964864903.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b5be870b4cd53cbc803a6b937bd0477d/24006863877.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/vivamulofizeko.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/lejubowotive.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/ziwibulatoguzoxipixodukum.pdfIn PDF document text
    • http://dkind.net/userData/board/file/29212357274.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/jamazikebifut.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///33713001516.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vurosedojogesabalex.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/97182371238.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133342c07b40---461132638.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/panuval.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/11e15da8737e11c59c9c4f1bf5e9dd36/gawixemebewuwixiwosevil.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/noforarolurutumomoxuli.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360620205fb---21984769659.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/30814805274.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pukuvakumakesepavivep.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/daseginisidado.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/63533798630.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nelasinakezamulisareju.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/37268478005.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90c31820---raxikasoromufamofelefuso.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/94f75ecc378bb18cc7e3e0fcce752d54/zijubag.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/5408271267.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/65017725467.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 17232 bytes
SHA-256: 19eed1010aadfa76bbf17e9dbae39c587358d7470bc3dff21159fe748ecf2530
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 9936 bytes
SHA-256: afa732b436897869580247d887489826605f2b96e26e8f09c95b8ca5265ab869
font_02_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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